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Firefox application error when closing 0xc0000005

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New Contributor

Firefox application error when closing 0xc0000005

Hi I've been getting errors every so often when closing firefox.

This is what I'm seeing http://i.imgur.com/VO3sA.jpg?1

I've been looking for a way to solve this error and figure out what is causing it. My search has brought me here. Some details.

This crash doesn't happen every time I close firefox I can't find a way to "make" it happen when closing it to reproduce it but it happens fairly often. I could go 2-3 days without it happening, the next day it might happen 3 times. The error only happens when closing firefox, it does not crash. Been happening for months. Reinstalled firefox many times

The extensions I use are: adblock plus 2.2.2 noscript 2.6.4.4

I've gone to about:crashes in my browser and looked at the most recent crash and found something odd. It lists 2 crashes for the same time.

1 is (this one is showing up as firefox verison 17.0.1) ID:9fb71784-ba7b-4925-9de4-608e12130202 Signature: F_2060112065______________________________

2nd is (this one is showing up as firefox verison Firefox 18.0) ID: 5ff65935-890a-4541-bd20-ac9b12130202 Signature: F2102588022______________________________________________________________________________________________________


Does this mean I have 2 firefox verisons installed and running at the same time? Only one shows up in task manager. So what do these crashes mean and why are the crash reports listing two verisons?

Thanks for the help.

2 REPLIES
Legendary Contributor

Re: Firefox application error when closing 0xc0000005

It happen because of Malware/Virus problem.


Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.


Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

New Contributor

Re: Firefox application error when closing 0xc0000005

Thanks for the reply, I'll report back when I have answers.